Accounts Receivable Facility (Details) - Accounts Receivable [Member] - USD ($) $ in Millions	1 Months Ended	3 Months Ended		5 Months Ended
	Oct. 31, 2015	Sep. 30, 2015	Mar. 31, 2015	Sep. 30, 2014	May. 16, 2014
Financing Receivable, Recorded Investment [Line Items]
Accounts Receivable Facility, Expiration Period				2 years
Maximum Funding Limit					$ 3,300
Receivables Facility, Amount of Funds Available		$ 900
Transfers of Financial Assets Accounted for as Sale, Initial Fair Value of Assets Obtained as Proceeds		1,391
Financing Receivable [Member]
Financing Receivable, Recorded Investment [Line Items]
Receivables contributed by the Originators to the SPEs		1,100
Accounts Receivable [Member]
Financing Receivable, Recorded Investment [Line Items]
Continuing Involvement with Derecognized Transferred Financial Assets, Amount Outstanding		1,800	$ 1,800
Cash received for sale of receivables under receivables facility		$ 400	500
Receivable from Conduits			1,300
Transfers of Financial Assets Accounted for as Sale, Initial Fair Value of Assets Obtained as Proceeds			$ 1,200
Subsequent Event [Member]
Financing Receivable, Recorded Investment [Line Items]
Receivables Facility, Amount of Funds Available	$ 600
Transfers of Financial Assets Accounted for as Sale, Initial Fair Value of Assets Obtained as Proceeds	2,100
Subsequent Event [Member] | Financing Receivable [Member]
Financing Receivable, Recorded Investment [Line Items]
Continuing Involvement with Derecognized Transferred Financial Assets, Amount Outstanding	1,100
Cash received for sale of receivables under receivables facility	100
Transfers of Financial Assets Accounted for as Sale, Initial Fair Value of Assets Obtained as Proceeds	1,000
Subsequent Event [Member] | Accounts Receivable [Member]
Financing Receivable, Recorded Investment [Line Items]
Cash received for sale of receivables under receivables facility	$ 300